碳酸氢钠干法脱硫工程应用及脱硫性能研究  

Engineering Application and Performance Study on Dry Desulfurization of Sodium Bicarbonate

作　　者：杜文韬 王伟明[3] 银登国 庄原发 金黄 李灵均 陈倬 DU Wentao;WANG Weimin;YIN Dengguo;ZHUANG Yuanfa;JIN Huang;LI Lingjun;CHEN Zhuo(Dongfang Boiler Co.,Ltd.,643001,Zigong,Sichuan,China;Clean Combustion and Flue Gas Purification Key Laboratory of Sichuan Province,611731,Chengdu,China;Anyang Iron and Steel Group Corporation,455000,Anyang,Henan,China)

机构地区：[1]东方电气集团东方锅炉股份有限公司,四川自贡643001 [2]清洁燃烧与烟气净化四川省重点实验室,成都611731 [3]安阳钢铁集团有限公司,河南安阳455000

出　　处：《东方电气评论》2022年第4期44-48,共5页Dongfang Electric Review

摘　　要：为了降低工业企业中SO2的排放量,通常在尾部设置脱硫系统,碳酸氢钠干法脱硫是一种低成本、高效率的脱硫系统,适用于烟气量不大、烟气中SO2浓度不高的项目。以某钢铁厂220 t/h燃气锅炉为例,介绍了碳酸氢钠干法脱硫的工程应用,并在该项目中进行了试验,通过试验研究了温度、钠硫摩尔比和布袋除尘器对脱硫效率的影响。试验结果表明,在120~165℃范围内,碳酸氢钠干法脱硫可实现超过98%的脱硫效率和长期不超过10 mg/Nm3的SO2排放指标;在测试期间,呈现钠硫比越高、脱硫效率越高的趋势;在脱硫效率超过95%时,钠硫摩尔比平均值为2.41;且在长期运行中,脱硫剂(碳酸氢钠)的实际用量比理论用量多11.5%;烟气中SO2在布袋除尘器中的脱除效率与脱硫塔中效果相当,甚至略高,布袋除尘器有利于深度脱除烟气中的SO2。Flue gas desulfurization is usually used to reduce SO2emission in industrial enterprises. Dry desulfurization of sodium bicarbonate is a low-cost and high-efficiency system, which is more suitable for projects with small amount of flue gas and low SO2concentration in flue gas. In this paper, the engineering application for a 220 t/h Gas-fired Boiler in an Iron & Steel Group using dry desulfurization of sodium bicarbonate is introduced, and the test was carried out in the project. The test shows that how the factors of the system, such as temperature, the stoichiometric ratio of sodium bicarbonate to sulfur(NSR) and bag filter affect the desulfurization efficiency. According to the results, in the range of120~165 ℃, the removal efficiency approached more than 98 % and the SO2emission concentration maintained less than10 mg/Nm~3. During the test, the desulfurization efficiency became higher when the NSR got higher and when the desulfurization efficiency exceeded 95 %, the average NSR was 2.41. In long-term operation, the actual amount of desulfurizer(sodium bicarbonate) was 11.5 % more than the theoretical amount. The test also shows that the SO2removal efficiency of bag filter was equivalent or even higher than the desulfurization tower, which means bag filter is a promoter for deep removal of SO2in flue gas.

关 键 词：碳酸氢钠 干法脱硫 工程应用 脱硫性能 

分 类 号：X773[环境科学与工程—环境工程]